12-Channel Multicell Battery Monitor
ADBMS6815
Data Sheet
FEATURES
TYPICAL APPLICATION CIRCUIT
4 MODULES SHOWN
Measures up to 12 battery cells in series
Maximum lifetime total measurement error: 1.5 mV
Stackable architecture for high voltage battery packs
Built-in isoSPI interface
2 Mb isolated serial communications
Uses a single twisted pair, up to 20 meters
Low EMI susceptibility and emissions
Bidirectional for broken wire protection
Capacitor or transformer coupled
MODULE 2
MODULE N – 1
+
isoSPI
PORT B
isoSPI
PORT A
UP TO
12
–t°
CELLS
ADBMS6815
ADBMS6815
UP TO
12
CELLS
–t°
isoSPI
PORT A
isoSPI
PORT B
+
MODULE 1
MODULE N
+
isoSPI
isoSPI
PORT A
Hot plug tolerant without external protection
ADBMS6815WFS models designed for use in ISO 26262
applications for Automotive Safety Integrity Level
Capability D (ASIL D)
PORT B
UP TO
12
CELLS
UP TO
12
CELLS
–t°
ADBMS6815
ADBMS6815
–t°
isoSPI
PORT A
isoSPI
PORT B
+
Diagnostics for IC and application circuit failure modes
304 μs to measure all cells in a system
16-bit ADC with programmable noise filter
Passive cell balancing up to 300 mA per channel with
programmable PWM
BAT+
OPTIONAL
REVERSIBLE
isoSPI
isoSPI
PORT
LOOP
LTC2949
BATTERY
PACK
MONITOR
7 GPIO or analog inputs
Temperature or other sensor inputs
isoSPI
LTC6820 LTC6820
SPI
4
isoSPI
Configurable as an I2C or SPI master
SPI
4
Sleep state supply current: 5.5 ꢀA
48-lead LQFP package with exposed pad
AEC-Q100 qualified for automotive applications
HV–
HV+
BMS CONTROLLER
(SAFETY MICROCONTROLLER)
CHASSIS
GND
Figure 1. Typical Application Circuit
APPLICATIONS
Electric and hybrid electric vehicles
Backup battery systems
Grid energy storage
Large portable power banks
GENERAL DESCRIPTION
The ADBMS6815 is a multicell battery stack monitor that
measures up to 12 series connected battery cells with a lifetime
total measurement error (TME) of less than 1.5 mV. The cell
measurement range of 0 V to 5 V makes the ADBMS6815
suitable for most battery chemistries. All 12 cells can be measured
in 304 μs, and lower data acquisition rates can be selected for
high noise reduction.
Multiple ADBMS6815 devices can be connected in series,
permitting simultaneous cell monitoring of long, high voltage
battery strings. Each ADBMS6815 has an isoSPI™ interface for
high speed, RF immune, long distance communications.
Multiple devices are connected in a daisy chain with one host
processor connection for all devices. This daisy chain can be
operated bidirectionally, ensuring communication integrity
even in the event of a fault along the communication path.
The ADBMS6815 can be powered directly from the battery
stack or from an isolated supply. The ADBMS6815 includes
passive balancing for each cell, with individual pulse-width
modulation (PWM) duty cycle control for each cell. Other
features include an on-board 5 V regulator, seven general-
purpose input/output (GPIO) lines, and a sleep state, where
current consumption is reduced to 5.5 μA.
The ADBMS6815WFS models are designed for use in
ISO 26262 applications for Automotive Safety Integrity Level
Capability D (ASIL D).
For more information on the ADBMS6815, visit the ADBMS6815 product page.
Rev. SpA
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